Accessory dwelling unit contractor — Boston, MA

Looking for accessory dwelling unit contractor in Boston, MA? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Boston and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

A contractor manages the trades, materials, and timeline required to complete your backyard home. You need a contractor when you have design plans ready or need a lead to coordinate electricians, plumbers, and carpenters to get the structure move-in ready. They act as your project manager, ensuring that the work is finished on schedule and adheres to the building plans filed with your local municipality. Their role is essential for keeping the construction phase organized and safe.

Frequently asked in Boston

What are the disadvantages of ADUs in Boston?

How much does an ADU cost in Massachusetts?

What are the rules for ADUs in Massachusetts?

Is ADU allowed in Maryland?

While this is about Boston, if you're asking about Maryland, many counties and cities there do allow ADUs, though specific rules vary. It's always best to check with your local planning department or consult with an experienced ADU professional in that specific region.

What are the rules for ADU in California?

California has some of the most ADU-friendly laws in the country, often simplifying the permitting process and limiting local restrictions. However, specific requirements still exist. If you're in California, a local expert can clarify the exact regulations for your area.

California has offered grants and financial assistance programs to help homeowners build ADUs, sometimes totaling tens of thousands of dollars. These programs have specific eligibility criteria and application processes. For current information on California ADU grants, you'd need to consult resources specific to that state.

Also serving nearby: Quincy · Cambridge · Lynn · Newton · Brockton

All cities in Massachusetts →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

653,833residents

13,525per sq mile

8ZIP codes served

Serving all of Boston — population 653,833; about 13,525 residents per square mile across 48.3 sq mi. ZIP codes covered include 02108, 02109, 02110, 02111, 02112, 02113, 02114, 02115.

Neighborhoods served in Boston: Back Bay, Beacon Hill, North End, South End, Charlestown, Dorchester — and every surrounding area.